Rapper Future -- I Have a Dream ... to Pay More Child Support

Rapper Future and his baby mama have reached a new custody deal ... which includes a schedule for Martin Luther King Day.

Future must now pay $2,800 a month in child support for his 11-year-old son -- that's up $1,200 from what he was previously paying. But it won't really cramp his style ... because according to court docs he earns $50K every month.

The new deal -- the result of Future's increased earnings -- lays out a plan for who gets the kid on big holidays, including Thanksgiving, XMAS, the child's birthday and MLK Day.

And there's this ... baby mama Jessica Smith agreed to move to a nicer neighborhood near Atlanta so the child could attend a better school.